Top Definition
When a friend of yours has recently started dating another, and is suddenly unable to attend and social gatherings because he is with said boo.
"What happened to Jim?" "He got a case of the Boo Flu, we won't hear from him until he is single again"
by RockSickle April 11, 2012

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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